Implement std::string_view as described in http://wg21.link/P0254R1. Reviewed as https://reviews.llvm.org/D21459

llvm-svn: 276238

2 files changed, 228 insertions, 0 deletions

diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/string_view.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/string_view.pass.cpp
new file mode 100644
index 00000000000..e56b094a36e
--- /dev/null
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/string_view.pass.cpp
@@ -0,0 +1,105 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// basic_string<charT,traits,Allocator>&
+//   assign(basic_string_view<charT,traits> sv);
+
+#include <string>
+#include <string_view>
+#include <cassert>
+
+#include "test_macros.h"
+#include "min_allocator.h"
+#include "test_allocator.h"
+
+template <class S, class SV>
+void
+test(S s, SV sv, S expected)
+{
+    s.assign(sv);
+    LIBCPP_ASSERT(s.__invariants());
+    assert(s == expected);
+}
+
+template <class S, class SV>
+void
+testAlloc(S s, SV sv, const typename S::allocator_type& a)
+{
+    s.assign(sv);
+    LIBCPP_ASSERT(s.__invariants());
+    assert(s == sv);
+    assert(s.get_allocator() == a);
+}
+
+int main()
+{
+    {
+    typedef std::string S;
+    typedef std::string_view SV;
+    test(S(), SV(), S());
+    test(S(), SV("12345"), S("12345"));
+    test(S(), SV("1234567890"), S("1234567890"));
+    test(S(), SV("12345678901234567890"), S("12345678901234567890"));
+
+    test(S("12345"), SV(), S());
+    test(S("12345"), SV("12345"), S("12345"));
+    test(S("12345"), SV("1234567890"), S("1234567890"));
+    test(S("12345"), SV("12345678901234567890"), S("12345678901234567890"));
+
+    test(S("1234567890"), SV(), S());
+    test(S("1234567890"), SV("12345"), S("12345"));
+    test(S("1234567890"), SV("1234567890"), S("1234567890"));
+    test(S("1234567890"), SV("12345678901234567890"), S("12345678901234567890"));
+
+    test(S("12345678901234567890"), SV(), S());
+    test(S("12345678901234567890"), SV("12345"), S("12345"));
+    test(S("12345678901234567890"), SV("1234567890"), S("1234567890"));
+    test(S("12345678901234567890"), SV("12345678901234567890"),
+         S("12345678901234567890"));
+
+    testAlloc(S(), SV(), std::allocator<char>());
+    testAlloc(S(), SV("12345"), std::allocator<char>());
+    testAlloc(S(), SV("1234567890"), std::allocator<char>());
+    testAlloc(S(), SV("12345678901234567890"), std::allocator<char>());
+    }
+
+#if TEST_STD_VER >= 11
+    {
+    typedef std::basic_string     <char, std::char_traits<char>, min_allocator<char>> S;
+    typedef std::basic_string_view<char, std::char_traits<char> > SV;
+    test(S(), SV(), S());
+    test(S(), SV("12345"), S("12345"));
+    test(S(), SV("1234567890"), S("1234567890"));
+    test(S(), SV("12345678901234567890"), S("12345678901234567890"));
+
+    test(S("12345"), SV(), S());
+    test(S("12345"), SV("12345"), S("12345"));
+    test(S("12345"), SV("1234567890"), S("1234567890"));
+    test(S("12345"), SV("12345678901234567890"), S("12345678901234567890"));
+
+    test(S("1234567890"), SV(), S());
+    test(S("1234567890"), SV("12345"), S("12345"));
+    test(S("1234567890"), SV("1234567890"), S("1234567890"));
+    test(S("1234567890"), SV("12345678901234567890"), S("12345678901234567890"));
+
+    test(S("12345678901234567890"), SV(), S());
+    test(S("12345678901234567890"), SV("12345"), S("12345"));
+    test(S("12345678901234567890"), SV("1234567890"), S("1234567890"));
+    test(S("12345678901234567890"), SV("12345678901234567890"),
+         S("12345678901234567890"));
+
+    testAlloc(S(), SV(), min_allocator<char>());
+    testAlloc(S(), SV("12345"), min_allocator<char>());
+    testAlloc(S(), SV("1234567890"), min_allocator<char>());
+    testAlloc(S(), SV("12345678901234567890"), min_allocator<char>());
+    }
+#endif
+}
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/string_view_size_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/string_view_size_size.pass.cpp
new file mode 100644
index 00000000000..1eb18d8bffa
--- /dev/null
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/string_view_size_size.pass.cpp
@@ -0,0 +1,123 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// XFAIL: libcpp-no-exceptions
+// <string>
+
+// basic_string<charT,traits,Allocator>&
+//   assign(basic_string_view<charT,traits> sv, size_type pos, size_type n=npos);
+// the =npos was added for C++14
+
+#include <string>
+#include <stdexcept>
+#include <cassert>
+
+#include "test_macros.h"
+#include "min_allocator.h"
+
+template <class S, class SV>
+void
+test(S s, SV sv, typename S::size_type pos, typename S::size_type n, S expected)
+{
+    try
+    {
+        s.assign(sv, pos, n);
+        LIBCPP_ASSERT(s.__invariants());
+        assert(pos <= sv.size());
+        assert(s == expected);
+    }
+    catch (std::out_of_range&)
+    {
+        assert(pos > sv.size());
+    }
+}
+
+template <class S, class SV>
+void
+test_npos(S s, SV sv, typename S::size_type pos, S expected)
+{
+    try
+    {
+        s.assign(sv, pos);
+        LIBCPP_ASSERT(s.__invariants());
+        assert(pos <= sv.size());
+        assert(s == expected);
+    }
+    catch (std::out_of_range&)
+    {
+        assert(pos > sv.size());
+    }
+}
+
+int main()
+{
+    {
+    typedef std::string S;
+    typedef std::string_view SV;
+    test(S(), SV(), 0, 0, S());
+    test(S(), SV(), 1, 0, S());
+    test(S(), SV("12345"), 0, 3, S("123"));
+    test(S(), SV("12345"), 1, 4, S("2345"));
+    test(S(), SV("12345"), 3, 15, S("45"));
+    test(S(), SV("12345"), 5, 15, S(""));
+    test(S(), SV("12345"), 6, 15, S("not happening"));
+    test(S(), SV("12345678901234567890"), 0, 0, S());
+    test(S(), SV("12345678901234567890"), 1, 1, S("2"));
+    test(S(), SV("12345678901234567890"), 2, 3, S("345"));
+    test(S(), SV("12345678901234567890"), 12, 13, S("34567890"));
+    test(S(), SV("12345678901234567890"), 21, 13, S("not happening"));
+
+    test(S("12345"), SV(), 0, 0, S());
+    test(S("12345"), SV("12345"), 2, 2, S("34"));
+    test(S("12345"), SV("1234567890"), 0, 100, S("1234567890"));
+
+    test(S("12345678901234567890"), SV(), 0, 0, S());
+    test(S("12345678901234567890"), SV("12345"), 1, 3, S("234"));
+    test(S("12345678901234567890"), SV("12345678901234567890"), 5, 10,
+         S("6789012345"));
+    }
+#if TEST_STD_VER >= 11
+    {
+    typedef std::basic_string     <char, std::char_traits<char>, min_allocator<char>> S;
+    typedef std::basic_string_view<char, std::char_traits<char> > SV;
+    test(S(), SV(), 0, 0, S());
+    test(S(), SV(), 1, 0, S());
+    test(S(), SV("12345"), 0, 3, S("123"));
+    test(S(), SV("12345"), 1, 4, S("2345"));
+    test(S(), SV("12345"), 3, 15, S("45"));
+    test(S(), SV("12345"), 5, 15, S(""));
+    test(S(), SV("12345"), 6, 15, S("not happening"));
+    test(S(), SV("12345678901234567890"), 0, 0, S());
+    test(S(), SV("12345678901234567890"), 1, 1, S("2"));
+    test(S(), SV("12345678901234567890"), 2, 3, S("345"));
+    test(S(), SV("12345678901234567890"), 12, 13, S("34567890"));
+    test(S(), SV("12345678901234567890"), 21, 13, S("not happening"));
+
+    test(S("12345"), SV(), 0, 0, S());
+    test(S("12345"), SV("12345"), 2, 2, S("34"));
+    test(S("12345"), SV("1234567890"), 0, 100, S("1234567890"));
+
+    test(S("12345678901234567890"), SV(), 0, 0, S());
+    test(S("12345678901234567890"), SV("12345"), 1, 3, S("234"));
+    test(S("12345678901234567890"), SV("12345678901234567890"), 5, 10,
+         S("6789012345"));
+    }
+#endif
+    {
+    typedef std::string S;
+    typedef std::string_view SV;
+    test_npos(S(), SV(), 0, S());
+    test_npos(S(), SV(), 1, S());
+    test_npos(S(), SV("12345"), 0, S("12345"));
+    test_npos(S(), SV("12345"), 1, S("2345"));
+    test_npos(S(), SV("12345"), 3, S("45"));
+    test_npos(S(), SV("12345"), 5, S(""));
+    test_npos(S(), SV("12345"), 6, S("not happening"));
+    }
+}